HEADS UP!!!

Site upgrade in progress... Core site functions are working, but some non-critical features/functions will be temporarily unavailable while we work to restore them over the next couple of weeks.

Please post any bugs you encounter, but before you do, check to see if it's already listed.

Thanks for your patience while we work to improve the community.

Sign in to follow this  
Followers 0
billykidd2000

How to determine if aftermarket jetting has been done??

7 posts in this topic

I just purchased a 2000 WR400F and I wanted to buy a JD Jetting kit but I'm not sure if there is already some aftermarket jetting done.

What's the best way to tell if it's been done? :crazy:

Share this post


Link to post
Share on other sites

Only way I can think of is to actually yank the jets and needle from the carb and see if the jets (numbers printed on them) match the stock settings and see if the needle is the stock one. The JD kit, at least mine, included a red colored needle and blue colored needle.

Share this post


Link to post
Share on other sites

My only experience is with an 03 wr 450, which I believe from memory is 45 on the pilot jet, 70 on the leak jet, and 160? something on the main jet. If you have the parts manual or can download it, I think you can find it there--but just a guess.

Share this post


Link to post
Share on other sites

here is the break down for the 2001, im not sure if its the same as the 2000 cause there were alot of changes. http://oem.thumpertalk.com/2001WR426Fcarburetor.aspx

scroll down to the parts list and you will see the standard jets along with the opptional. You will have to pull your float bowl off to pull your jets and check the numbers on them.

Why are you jetting?

Share this post


Link to post
Share on other sites

Go to Yamaha 's web site. Their is a parts section where you can look up all the info you need. 165 is the stock main and 45 is the stock pilot according to their info.

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now
Sign in to follow this  
Followers 0